I am 24 years old with 2,5 years of professional experience in Mkt. I love the field and I'd like to enhance my knowledge of it.

I feel that I currently don't have the required experience to do a MBA in a well-known institution, so my initial plan was to start a Msc in Marketing in Sep 2017.
Is this the correct choice?

How worth is it do a Msc in Marketing? Would it be better if I waited a couple of years and do a MBA focused on Marketing, for example?

I don't know where in the world you are but, from the MSc term, I guess you are in Europe. If your interest is only in marketing, then the other courses in an MBA might not interest you. An MBA would be available to you now since you'd have three years by the time you started. However, perhaps an MSc in marketing at a top business school like Copenhagen, Cranfield, ESADE, ESCP, ESSEC, Lancaster, Rotterdam, UC3M etc might be a good compromise?

Hello ! I want to apply for msc in marketing at Uc3m but I heard it is very hard to study there ,, does anyone know how is the academic curriculum there ?